Removes eager initialization of the CompressionCodecResolver in the JwtParserBuilder

This removes a potential service loader issue with OSGi runtimes.

Fixes: #578

Author: bdemers

impl/src/main/java/io/jsonwebtoken/impl/DefaultJwtParserBuilder.java

@@ -55,7 +55,7 @@ public class DefaultJwtParserBuilder implements JwtParserBuilder {
 
     private SigningKeyResolver signingKeyResolver;
 
-    private CompressionCodecResolver compressionCodecResolver = new DefaultCompressionCodecResolver();
+    private CompressionCodecResolver compressionCodecResolver;
 
     private Decoder<String, byte[]> base64UrlDecoder = Decoders.BASE64URL;
 
@@ -191,6 +191,11 @@ public JwtParser build() {
             this.deserializer = Services.loadFirst(Deserializer.class);
         }
 
+        // if the compressionCodecResolver is not set default it.
+        if (this.compressionCodecResolver == null) {
+            this.compressionCodecResolver = new DefaultCompressionCodecResolver();
+        }
+
         return new ImmutableJwtParser(
                 new DefaultJwtParser(signingKeyResolver,
                                      key,